Device for controlling energy delivered to welding-electrodes.



H. R. WOODROW; DEVICE FOR CONTROLLING ENERGY DELIVERED T0 WELDINGELECTRODES.

APPLICATION FILED NOV-17.1915- Patented June 19, 1917.

UNITED STATES PATENT OFFICE.

' HARRY R. WOODROW, OF NEW YORK, N. Y., ASSIGNOR TO THOMAS E. MURRAY, OFNEW YORK, N. Y.

DEVICE FOR CONTROLLING ENERGY DELIVERED TO WELDING-ELECTRODES.

Specification of Letters Patent.

Application filed November 17, 1915. Serial No. 61,864.

To all whom it may concern:

Be it known that I, HARRY R. IVoonRow, a citizen of the United States,residing 'at New York, in the county of New York and State of New York,have invented a certain new and useful Improvement in Devices forControlling Energy Delivered to Welding- Electrodes, of which thefollowing is a specification.

The invention is a device for measuring a top new and Fig. 3 is anelevation of the watt-meter relay.

Similar numbers and letters of reference indicate like parts.

The objects A, B to be welded together are respectively carried by thefixed electrode C and the movable electrode D. The movable electrode Dis actuated by any suitable means toward the electrode C in order topress the ends of the objects A, B together. This pressure may beapplied, for example, by a toggle E having one end fixed and the otherend connected to electrode D, which toggle is straightened out by theweight F suspended from the middle joint.

To the electrodes C, D are connected the terminals of the secondary coilof a transformer G, the primary coil terminals being connected tocontact 1 of switch H and contact 2 of switch I. Said switches alsocooperate respectively with the contacts 3 and 4. Each switch carriesthe plunger armature of an actuating solenoid J K for opcrating saidswitches. "The welding current is derived from the alternating generatorM, the terminals of which are connected to the switch contacts 3 and 4.The coils J, K are connected in multiple with the terminals of a directcurrent auxiliary generator N. In the branch circuit which includes coilJis a hand switch 0. In the branch circuit 7 which includes the coil Kis a switch P.

The switch P is controlled by a wattcoil; 7 is the usual disk armaturesupported,

on the spindle 8. To said spindle is connected one end of a Hooke spring9. the other end being secured to a fixed abutment. which springcouuterbalances the rotary movement of the armature, so that the energyof the current is balanced against the resilience of the spring andmeasured by the extent of angular or rotatory movement. of the armature.Any suitable indicating 1nechanis1nhere omitted for clearness may becombined with the armature for obtaining a reading of the extent of saidmovement in terms of watts and fractions thereof.

The armature spindle controls the switch P by means of a cam 10, uponwhich cam runs a roller 11 carried by said'switch. Said switch at itsend carries a contact 12 cooperating with contact 13 carried by anadjusting screw 14, by means ofwhich the operation of switch P may betimed in accordance with any desired position of roller 11 on cam 10,and hence with regard to any predetermined angular movement of rotationof armature 7, and hence with regard to a predetermined amount of energydelivered to the watt-meter relay. The current coil 5 is connected to acurrent transformer 15, of which the primary is in circuit With' thesecondary coil of the transformer G. The potential coil 6 is connectedto one terminal of said primary and to the switch contact 4. The usualarmature brake is shown at 16.

The operation is as follows:

Switch H is closed, and switches O and P are open. The objects A, B arepressed together. Switch 0 is closed, thereby closing switch I. Circuitis thus established to the welding point and to the watt-meter relay.The armature 7 of said relay rotates, and in turn rotates cam 10. Afterthe armature has moved over the predetermined angle corresponding to acertain expenditure of energy, circuit is thus closed at switch P, tocoil K, which opens switch H, thus cutting off the current supply to theweld. As the armature also operates the usual indicating apparatus, thedevice will measure the amount of energy passing to the weld,

Patented June 19, 1917.v

besides automatically disconnecting the weld when a predetermined amounthas passed, regardless of fluctuating voltage or variations inconditions at the welding contacts.

I claim:

1. In combination with welding electrodes and a source of energycommunicating therewith, means automatically operating to disconnectsaid source when a predetermined amount of energy has passed to saidelectrodes.

2. In combination with welding electrodes and a source of energycommunicating therewith, means automatically operating to disconnectsaid source when a predetermined amount of energy has passed to saidelectrodes, and to measure said amount.

3. In combination with welding electrodes a source of welding current,and a wattmeter relay in circuit with said source and controlling saidcircuit.

4. In combination with welding electrodes, a source of-welding current,a wattmeter relay in circuit with said source, and means controlled bysaid relay for opening said-circuit when a predetermined amount ofenergy has passed to said electrodes.

5. In 'combmation with welding electrodes, a source of welding current,a wattmeter relay in circuit with said source, a

switch in said circuit, and a switch com trolled by said relay andoperating to open said first-named switch when a predetermined amount ofenergy has passed to said electrodes.

6. In combination with welding electrodes, a source of weldin current,two switches respectively place in the leads from said source to saidelectrodes, an independent source of current controlling said switches,a manually operable switch in one of said leads, a watt-meter relay incircuit with said source of welding current, and a switch operated bysaid relay to open the switch in the other of said leads when apredetermined amount of energy has passed to said electrodes.

7 In combination with welding electrodes and a source of weldingcurrent, a watt-meter relay in circuit with said source, a switch insaid circuit, an independent source of current for actuating saidswitch, a switch in circuit with said source, anda cam on the armaturespindle of said relay for opening said last-named switch.

In testimony whereof I have aflixed my signature in presence of twowitnesses.

HARRY R. WOODROW.

Witnesses:

GERTRUDE P. PORTER, MAY T. MOGABRY.

